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Research · Altcoins

Bitcoin dominance and alt performance

Dominance is a ratio of two capitalisations, and a ratio is a composition measure. It tells you how the market is divided, not what is driving the parts — and it moves for reasons that have nothing to do with alt demand.

Last reviewed 2026-09-21Source: CoinGecko global market data; Coin Metrics community network dataDefinitional and methodological discussion. No dominance percentage is asserted without its vintage and asset universe.

What the ratio actually is

Bitcoin dominance is bitcoin's market capitalisation divided by the total market capitalisation of a defined set of crypto assets. Both the numerator and the denominator are constructed quantities: market capitalisation is a price multiplied by a circulating supply, and the circulating supply of most assets is an estimate maintained by a data provider rather than a figure the protocol enforces.

The denominator is the more fragile part. It depends on which assets are included, and the inclusion rule is a provider's editorial decision. Adding a large asset to the universe mechanically lowers dominance without any change in bitcoin's price or supply. The companion page on market capitalisation sets out why the measure itself is an approximation; dominance inherits every one of those problems and adds a second constructed quantity on top.

Because it is a ratio, dominance can fall for two entirely different reasons: bitcoin's capitalisation can fall, or the rest of the universe can rise. A reader who treats a falling dominance figure as evidence of alt strength is reading only one of the two possible causes, and the data alone does not say which one occurred.

Known distortions

The distortions that affect the Bitcoin dominance ratio, how each one operates, and what it means for interpretation.
DistortionHow it operatesWhat it means for the reader
Changing universeThe set of assets in the denominator is a provider's choice and changes as assets are added or removedA move in dominance may reflect a change in the index rather than a change in the market
Estimated circulating supplyMost supplies are provider estimates, and the treatment of locked, treasury and burned coins variesThe denominator carries an error that is not reported alongside the ratio
Stablecoin inclusionDollar-pegged tokens are large and are usually counted in the total, though they are not a risk asset in the same senseA shift into stablecoins can register as a rise in bitcoin's share without any bitcoin buying
Wrapped and derivative claimsWrapped representations of bitcoin are counted as separate assets in some universesThe same underlying exposure can be counted twice, inflating the denominator

Last reviewed 2026-09-21Source: CoinGecko methodology documentation and provider notesThe distortions are documented properties of the measure, not estimates of their current size.

A composition measure, not a driver

The most common error in reading dominance is to treat it as a cause. Statements like "money is rotating out of alts into bitcoin, so dominance is rising" describe a reallocation, and the dominance figure is a consequence of that reallocation rather than a force acting on prices. Nothing about the ratio constrains what any individual asset does.

The second error is to treat dominance as a target. Because the ratio has ranged within a band historically, it is tempting to read a level near the top of that band as a signal that alts are cheap. That inference requires the band to be stable, and the band is a product of the universe and the supply estimates, both of which change. A level that was extreme under one universe is not necessarily extreme under another.

What dominance is genuinely useful for is describing the composition of the market at a point in time, with its vintage and universe stated. Used that way it is a legitimate descriptive statistic. Used as a timing signal or as evidence of causation, it is being asked to do something a ratio cannot do.

Dataset, period, method and limitations

Dataset. Aggregate market capitalisation for bitcoin and for the wider universe, from CoinGecko's global market data, with Coin Metrics community data used to cross-check bitcoin's own capitalisation. The universe is the provider's, and it is not the same universe another provider would use.

Period. The discussion is framed over the period for which the provider's universe is documented and comparable. Because the universe changes, a dominance series spanning many years is not computed on a consistent basket, and that should be stated with any figure.

Method. Dominance is bitcoin's capitalisation divided by the total, both taken from the same provider on the same date so the ratio is internally consistent. Mixing a numerator from one provider with a denominator from another introduces an error that is not visible in the result.

Limitations. The measure inherits every weakness of market capitalisation and adds the universe-selection problem. It cannot distinguish a fall caused by bitcoin's decline from one caused by the rest of the market's advance. And because the denominator includes assets whose supplies are estimates, the ratio carries an unreported error term that is larger than the precision with which it is usually quoted.

Sources and references

The definitional discussion draws on the data providers' own methodology notes and on this site's treatment of market capitalisation.

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